/ ˈsaʊndtræk; NAmE / noun
1.
all the music, speech and sounds that are recorded for a film / movie :
The soundtrack of 'Casablanca' took weeks to edit.
2.
some of the music, and sometimes some speech, from a film / movie or musical play that is recorded on tape or disc for people to buy :
I've just bought the soundtrack of the latest Tarantino movie.